CARLOS ALBERTO DA SILVA QUEIROZ

CARLOS ALBERTO DA SILVA QUEIROZ

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Production of high purity samarium acetate for use in nuclear area
2021 - QUEIROZ, CARLOS A. da S.; PEDREIRA FILHO, WALTER dos R.
Samarium is currently used in many applications, such as catalysts, lasers and metal alloys. Samarium is also employed to absorb neutrons in nuclear reactors. In medicine, samarium is used in the form of radioactive 153Sm to produce radiopharmaceuticals. A simple process for the preparation of pure samarium acetate was studied. The raw material, which was used in the form of rare earth carbonates was produced industrially from the chemical treatment of Brazilian monazite. Ion exchange chromatography was performed using a strong cationic resin to fractionate rare earth elements (REE). Under these conditions, 99.9% pure Sm2O3 and yield greater than or equal 60% was eluted by ammonium salt of ethylenediaminetetraacetic acid (EDTA) solution in con-trolled pH. The EDTA-samarium complex was transformed into samarium oxide, which was subsequently dis-solved in acetic acid to obtain the samarium acetate. Molecular absorption spectrophotometry was used to moni-tor the samarium and sector field inductively coupled plasma mass spectrometry was used to certify the purity of the samarium acetate. The solid salt was characterized by chemical analysis, thermal analysis, infrared spectros-copy and X ray diffraction. The analytical data collected allowed to conclude that stoichiometric formula for the samarium acetate obtained is Sm(CH3COO)3.4.H2O.
Trace amounts of rare elements in high pure gadolinium oxide by sector field inductively coupled plasma mass spectrometry (SF ICP-MS)
2003 - PEDREIRA, W.R.; QUEIROZ, C.A.S.; ABRAO, A.; PIMENTEL, M.M.
Determinacao de impurezas de terras raras em oxido de neodimio de alta pureza (Ndsub(2)Osub(3)) pela espectrometria de massa com fonte de plasma induzido por argonio (HR-ICPMS) com separacao de matriz pelo cromatografo de liquido de alta eficiencia (HPLC)
1999 - PEDREIRA FILHO, W.R.; SARKIS, J.E.S.; BONA, I.A.T.; QUEIROZ, C.A.S.; ABRAO, A.; RODRIGUES, C.
High purity samarium oxide from mixed rare earth carbonates
2013 - QUEIROZ, CARLOS A. da S.; PEDREIRA FILHO, WALTER dos R.; SENEDA, JOSE A.; VASCONCELLOS, MARI E. de
Produção de lantânio de alta pureza para aplicação em P&D
2002 - VASCONCELLOS, M.E.; QUEIROZ, C.A.S.; ROCHA, S.M.R.; SENEDA, J.A.; PEDREIRA FILHO, W.R.; SARKIS, J.E.S.; FORBICINI, C.A.L.G.O.; ABRAO, A.
High purity samarium acetate from mixed rare earth carbonates
2013 - QUEIROZ, CARLOS A. da S.; SENEDA, JOSE A.; PEDREIRA, WALTER dos R.; VASCONCELLOS, MARI E. de
Determination of trace amounts of rare-earth elements in highly pure neodymium oxide by sector field inductively coupled plasma mass spectrometry (ICP-SFMS) and high-performance liquid chromatography (HPLC) techniques
2002 - PEDREIRA FILHO, W.R.; SARKIS, J.E.S.; QUEIROZ, C.A.S.; RODRIGUES, C.; TOMIYOSHI, I.A.; ABRAO, A.
Determination of trace amounts of rare earth elements in high pure lanthanum oxide by sector field inductively coupled plasma mass spectrometry (HR ICP-MS) and high-performance liquid chromatography (HPLC) techniques
2001 - PEDREIRA FILHO, W.R.; SARKIS, J.E.S.; RODRIGUES, C.; TOMIYOSHI, I.A.; QUEIROZ, C.A.S.; ABRAO, A.
High purity neodymium acetate from mixed rare earth carbonates
2011 - QUEIROZ, CARLOS A. da S.; ROCHA, SORAYA M.R. da; PEDREIRA, WALTER dos R.; VASCONCELLOS, MARI E. de; LOBO, RAQUEL M.; SENEDA, JOSE A.
Determination of trace amounts of rare earth elements in highly pure praseodymium oxide by double focusing inductively coupled plasma mass spectrometry and high-performance liquid chromatography
2000 - PEDREIRA FILHO, W.R.; SARKIS, J.E.S.; RODRIGUES, C.; TOMIYOSHI, I.A.; QUEIROZ, C.A.S.; ABRAO, A.